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Lubricating oil composition having improved oxidation stability at high temperatures

a technology of lubricating oil and high temperature, which is applied in the preparation of carboxylic compounds, fuels, organic chemistry, etc., can solve the problems of deterioration and viscosity increase of lubricating oil, severe operation conditions of diesel engines for electric power generation and operation of marine vessels, and forced to employ low grade fuels with increased sulfur content, etc., to improve oxidation stability and improve high temperature oxidation stability

Active Publication Date: 2007-06-21
CHEVRON JAPAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] In a further embodiment the present invention relates to a method of improving the oxidation stability at high temperatures of an internal combustion engine, particularly a four stroke trunk piston diesel engine, by operating the internal combustion engine with the lubricating oil composition of the present invention.
[0013] Among other factors, the present invention is based on the surprising discovery that a certain lubricating oil composition provides improved high temperature oxidation stability when employed in internal combustion engines such as diesel engines and gasoline engines.

Problems solved by technology

Recently, the operation conditions of diesel engines for generation of electric power and operation of marine vessel have been getting severe.
In addition, these diesel engines are forced to employ a low grade fuel having increased sulfur content.
Moreover, the recent demand for economical operation and increase of maintenance efficiency requires extended service periods for using a lubricating oil with no substantial exchange.
Therefore, after the engine is operated continuously for a long period of time, the lubricating oil suffers from deterioration and viscosity increase.

Method used

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  • Lubricating oil composition having improved oxidation stability at high temperatures
  • Lubricating oil composition having improved oxidation stability at high temperatures

Examples

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example 1

[0032] A lubricating oil composition (TBN: 30 mg•KOH / g, SAE viscosity grade: SAE 40) was prepared using the following additives and base oil:

[0033] a) overbased calcium carboxylate (TBN: 145 mg•KOH / g, a mixture of a compound of the aforementioned formula in which R has 12 to 18 carbon atoms and a compound of the formula in which R has 20 to 28 carbon atoms, in a weight ratio of 50:50 in an amount of 1.15 wt % in terms of Ca content;

[0034] b) bis-structure succinimide dispersant (nitrogen content 0.018 wt %, prepared by reaction between polyalkylene polyamine (containing nitrogen atoms of 5.0 (mean number) in a molecule) and a product produced by thermal reaction of polybutene (number average molecular weight: approx. 1,000, having at least 50 mole % of methylvinylidene structure) and maleic anhydride) in an amount of 0.018 wt % in terms of N content;

[0035] c) zinc di(secondary)alkyldithiophosphate (P 0.049 wt %, Zn 0.054 wt %, S 0.14 wt %, prepared using a secondary alcohol conta...

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Abstract

A lubricating oil composition having a TBN in the range of 5 to 55 mg KOH / g and containing a major amount of a base oil of lubricating viscosity and a) 0.19 to 2.10 wt %, based on the total amount of the lubricating oil composition, of an overbased calcium carboxylate having a TBN of 100 mg KOH / g or more, wherein the wt % is expressed in terms of the calcium content; b) 0.002 to 0.06 wt %, based on the total amount of the lubricating oil composition, of a bis-succinimide compound, wherein the wt % is expressed in terms of the nitrogen content; and c) 0.007 to 0.15 wt %, based on the total amount of the lubricating oil composition, of a zinc dialkyldithiophosphate having a secondary alkyl group, wherein the wt % is expressed in terms of the phosphorus content.

Description

[0001] The present invention relates to a lubricating oil composition. More particularly, the present invention relates to a lubricating oil composition having improved oxidation stability at high temperatures when employed in an internal combustion engines. BACKGROUND OF THE INVENTION [0002] Diesel engines, particularly four stroke trunk piston diesel engines, are generally employed as internal combustion engines for generation of electric power and operation of marine vessels. These internal combustion engines are operated smoothly using a lubricating oil composition which contains various additives. [0003] Generally, most additives employed in lubricating oil compositions are metal-containing detergents. Specifically, an over-based metal-containing detergent which neutralizes sulfur oxide produced by the combustion of fuel and disperses combustion deposits such as sludge is generally employed. Particularly, a lubricating oil composition for marine diesel engines which is operated...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10L1/22
CPCC10M163/00C10M2207/26C10M2207/262C10M2215/28C10M2223/045C10N2210/02C10N2220/022C10N2230/06C10N2230/08C10N2230/52C10N2240/10C10N2240/102C10N2010/04C10N2020/02C10N2030/06C10N2030/08C10N2040/25C10N2030/52C10N2040/252
Inventor NAGAMATSU, HIROYUKI
Owner CHEVRON JAPAN
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